The easiest way is Composition --> Save Frame As --> File, and in the Render Queue click Photoshop and change that to Targa Sequence. That should export a TGA file in the correct game format.
This mod works well; I encountered no bugs during my playthrough. The spliced dialogs are highly believable in-game.
More importantly, and what I appreciate most about it, is that providing Revan with a more complete set of relationship possibilities makes the character more nuanced, believable, and customized, deepening the role-playing aspect (by putting more choice in the player's hands) and helping to tie the two games together (in the presence of K1 alternate romance mods that have existed for quite some time). Even though the romantic elements of TSL are pared down, it is great not to have romantic backstory imposed on you when your choices in the first game differed substantially. In extreme cases, the player might not even pick up on a Carth/female Revan romance angle in TSL, because they've always played female Revan w/ Bastila romance mod in K1.
I also appreciate the work the author has gone through to package this up nicely, iron out the bugs, flesh out compatibility info, and provide all the steps needed to make the mod work from existing saves. It is really nice to have these alt-romance mods in bug-reduced forms.